Create a cart with one line item wrong api example used

[shahadathossen-dev]

The found issue url: https://github.com/Shopify/storefront-api-learning-kit#managing-a-cart
Actual api example used of "customerAccessTokenCreate" api rather it should be the "cartCreate" api. It may confuse the viewers so it should be updated accordingly.

[Cyclodex]

I guess this is solved, you can close this issue

https://github.com/Shopify/storefront-api-learning-kit?tab=readme-ov-file#manage-a-cart

https://github.com/Shopify/storefront-api-learning-kit/blob/54654b9d032fe41861f8ce422f7e2bf48d9257d4/examples/08_manage_a_cart/01_create_a_cart_with_one_line_item/query.graphql